Small Dose Phase
Part of Foraging Edible Plants
The small dose phase is the critical ingestion stage of the Universal Edibility Test — the point where a plant enters your digestive system for the first time. This is where systemic toxins reveal themselves.
Why Ingestion Testing Exists
Every test before this point — skin contact, lip test, tongue test, chew-and-hold — has been about surface contact. Those stages catch irritants, burning compounds, and substances that affect mucous membranes. But many of the most dangerous plant toxins are invisible to surface tests. They pass through your mouth without any sensation at all and only become lethal once they reach your stomach, liver, or bloodstream.
Death cap mushrooms (Amanita phalloides) taste pleasant. Castor beans are mild. Water hemlock root smells like parsnip. These plants would pass every surface test without a hint of danger. The ingestion phase is designed to catch these poisons by exposing your body to a dose small enough that even a toxic plant is unlikely to kill you — though it may make you very sick.
This is the highest-risk stage of the Universal Edibility Test. It demands patience, discipline, and the willingness to endure a miserable 8 hours if things go wrong.
Prerequisites
You must have completed ALL prior UET stages with no reactions:
- 8-hour fast — stomach empty for clear symptom baseline
- Skin contact — 15 minutes on inner wrist, no reaction
- Lip test — 15 minutes on lips, no reaction
- Tongue test — 15 minutes on tongue tip, no reaction
- Chew and hold — chewed a small piece, held in mouth 15 minutes without swallowing, no reaction
Warning
If you skipped any preceding stage, you are gambling with your life. Each stage is designed to catch a different class of toxin at a survivable dose. Jumping to ingestion without completing them removes your safety net.
Step-by-Step Procedure
First Ingestion (Minimal Dose)
Step 1 — Prepare a piece of the plant part approximately the size of your thumbnail. This is roughly 2-3 grams. Prepare it in the exact same way (raw, boiled, roasted) that you used during the chew-and-hold phase.
Step 2 — Chew the piece thoroughly and swallow it. Note the exact time.
Step 3 — Consume nothing else for the next 8 hours. Water is permitted and encouraged — staying hydrated helps your body process potential toxins and makes vomiting less damaging if it becomes necessary.
Step 4 — Monitor yourself continuously for the following symptoms:
| Timeframe | Symptoms to Watch For | Likely Cause |
|---|---|---|
| 0-30 min | Nausea, burning in throat or stomach | Direct GI irritants (saponins, oxalates) |
| 30 min - 2 hr | Cramping, diarrhea, excessive salivation | Gastrointestinal toxins |
| 2-4 hr | Dizziness, headache, blurred vision | Systemic absorption of alkaloids |
| 4-6 hr | Muscle weakness, tremors, confusion | Neurotoxic compounds |
| 6-8 hr | Delayed nausea, abdominal pain | Hepatotoxins (liver-damaging compounds like those in death caps) |
Step 5 — If any symptom occurs at any point during the 8 hours:
- Induce vomiting immediately — stick two fingers down your throat, or drink warm saltwater (2 tablespoons salt per cup of water)
- Drink large amounts of clean water to dilute remaining toxins
- The plant has failed the test — discard it permanently
- Do not attempt to retest this plant part in any form
Step 6 — If 8 hours pass with absolutely no symptoms — no nausea, no cramping, no headache, no unusual sensations of any kind — proceed to the second ingestion.
Second Ingestion (Larger Dose)
Step 7 — Eat a small handful of the same plant part, prepared the same way. This is approximately 30-50 grams — roughly 10 to 15 times the first dose.
Step 8 — Again, eat nothing else for 8 hours. Continue monitoring for all symptoms listed above.
Step 9 — If no reaction occurs after this second 8-hour window, this specific part of this specific plant, prepared in this specific way, is considered conditionally safe for regular consumption.
Understanding “Conditionally Safe”
Passing the UET does not make a plant absolutely safe. It means:
- This specific plant part (leaf, root, stem, fruit, flower) did not cause acute toxicity at moderate doses
- Prepared in this specific way (raw, cooked, etc.)
- In your body (individual reactions vary — what is safe for you may not be safe for someone else)
It does NOT mean:
- Other parts of the same plant are safe (rhubarb stalks are edible; rhubarb leaves can kill you)
- The plant is safe in large quantities or over long periods (some toxins accumulate)
- The plant is safe at different stages of growth (pokeweed shoots are edible when young and processed; mature plants are toxic)
- The plant is nutritious — it may simply be non-toxic but also non-nutritive
Dose Matters: Why Thumbnail First
The first dose is deliberately tiny for a mathematical reason. Most plant toxins have a dose-response relationship — the amount you consume determines the severity of the effect. A thumbnail-sized piece of even a highly toxic plant is unlikely to deliver a lethal dose to an adult.
| Toxin Example | Lethal Dose (Adult) | Amount in Thumbnail Piece | Safety Margin |
|---|---|---|---|
| Ricin (castor bean) | ~1 mg | ~0.05-0.1 mg | 10-20x below lethal |
| Amatoxin (death cap) | ~0.1 mg/kg (~7 mg) | ~0.3-0.5 mg | 14-23x below lethal |
| Coniine (hemlock) | ~100-300 mg | ~2-5 mg | 20-60x below lethal |
These margins are not comfortable, but they are usually sufficient to produce warning symptoms (nausea, cramping) without causing irreversible damage. The key word is “usually” — this is why the UET is a last resort, not a casual experiment.
Warning
Children, elderly, pregnant women, and anyone who is already ill or severely malnourished have much smaller safety margins. The UET is calibrated for a reasonably healthy adult. For vulnerable individuals, even the thumbnail dose could be dangerous with certain toxins.
What Vomiting Tells You
If you need to induce vomiting during the test, the timing of your symptoms reveals what kind of toxin you encountered:
Immediate nausea (within 30 minutes): The plant contains direct GI irritants — saponins, raphides (calcium oxalate crystals), or similar compounds. These are the “least bad” outcome because your body detected the threat quickly. Recovery is usually within 24 hours.
Delayed nausea (2-6 hours): The toxin required absorption into the bloodstream before symptoms appeared. This is more concerning because some of the compound has already entered your system. Drink maximum water, rest, and monitor for 48 hours.
Very delayed symptoms (6-12+ hours): This pattern is characteristic of the most dangerous toxins — hepatotoxins like amatoxin from death cap mushrooms. By the time symptoms appear, significant liver damage may already be occurring. This is a medical emergency even in a post-apocalyptic scenario. If you have access to activated charcoal, take it. Otherwise, hydrate aggressively and rest.
Managing the 8-Hour Wait
The wait is psychologically difficult, especially when you are hungry. Strategies:
- Stay busy with non-strenuous tasks — gathering firewood, repairing shelter, weaving cordage
- Stay near water — both for hydration and in case you need to induce vomiting
- Stay near your camp — if a reaction hits, you do not want to be far from shelter
- Do not sleep during the first 4 hours — you need to be conscious to detect early symptoms. After 4 hours with no reaction, light sleep is acceptable if someone else can monitor you
- Log symptoms mentally — note exactly when any sensation occurs, even if you think it is unrelated. Hunger pangs from your fast are normal; new or unusual sensations are not
After a Successful Test
Once a plant part passes both ingestion phases:
Step 1 — Memorize every identifying feature of the plant: leaf shape, stem characteristics, flower color, growth habitat, smell, season.
Step 2 — If possible, keep a sample (pressed leaf, dried flower) as a reference for comparison with future plants.
Step 3 — Teach others in your group to identify it. One person’s knowledge dies with them.
Step 4 — Start with moderate quantities in your diet. Even a plant that passed the UET should be introduced gradually — eat it as one component of a meal, not your entire diet, for the first week.
Step 5 — Monitor for long-term effects over the following days. Some compounds cause cumulative toxicity that a single test cannot detect.
Key Takeaways
- The small dose phase catches systemic toxins that surface tests (lip, tongue) cannot detect
- First dose is thumbnail-sized — small enough to produce warning symptoms without lethal toxicity in most cases
- Monitor for a full 8 hours after each ingestion, consuming nothing else
- Symptom timing reveals the type of toxin: immediate = GI irritant, delayed = systemic, very delayed = hepatotoxin (most dangerous)
- Induce vomiting at the first sign of any abnormal symptom — do not “wait and see”
- A passed test means “conditionally safe for this part, prepared this way, for you” — not universally safe
- The UET is a last resort when starvation is the alternative, never a casual experiment